100 North Central Expressway, Skyscraper in Main Street District, Dallas, US

100 North Central Expressway is a twelve-story office tower in downtown Dallas with a glass and metal exterior. The building sits beside a seven-story parking structure that was constructed as part of the original development.

Announced in 1958 as the new home of Blue Cross Blue Shield of Texas, the twelve-story building opened in June 1960 with a curtain wall and masonry exterior and an attached seven-story garage. Its 450 employees worked on the upper floors, and the twelfth floor held a staff cafeteria-auditorium. After the company left for Richardson, the exterior was refitted in 1982 with bronze, silver and gray glass.

The building's name comes from the Salazar family, who owned it after Blue Cross Blue Shield left for Richardson in 1982. That same year the original curtain wall and masonry were stripped and replaced with bronze, silver and gray glass, so the present facade dates from the 1982 renovation rather than the 1960 opening.

The tower sits at a major intersection making it easy to locate and there is parking available on site. Walking from the Main Street District to reach this building takes only a few minutes.

The building once featured a large electronic message board on its roof that displayed rotating messages multiple times per minute. This illuminated sign was a notable feature of the Dallas skyline during the 1960s and early 1970s.